液晶与显示2017，Vol.32Issue(1)：23-28,6.DOI:10.3788/YJYXS20173201.0023
采用稀疏读出策略的电容触摸屏前端 IC 设计
Design of analog front-end IC for capacitive touch screen using sparse readout strategy
摘要
Abstract
Capacitive multi-touch screens using touch predicting and window sensing (TPWS)readout strategy are susceptible to display noise and charger noise interferences.In this paper,a parallel com-plementary driving and differential sensing method are proposed to improve the SNR of TPWS system.A new 48-channel analog front-end IC is designed and realized using 0.35 μm CMOS process based on the parallel complementary driving and differential sensing method.In addition,an 1 1.6 in prototype touch screen system is designed to evaluate the performances of the analog front-end IC. The measurement results indicate that,the analog front-end IC designed in this paper can satisfies the requirements of TPWS system for line and point scanning,and furthermore,the SNR of the TPWS system is increased from 25.0 dB to 35.8 dB.关键词
电容触摸屏/模拟前端 IC/稀疏读出/并行互补驱动/差分感应Key words
capacitive touch screen/analog front-end IC/sparse readout/parallel complementary driv-ing/differential sensing分类
信息技术与安全科学引用本文复制引用
李博,魏廷存,魏晓敏..采用稀疏读出策略的电容触摸屏前端 IC 设计[J].液晶与显示,2017,32(1):23-28,6.基金项目
2015陕西省科技计划统筹项目(No．2015KTZDGY03-03) Supported by Project of Science and Technology Planning in Shaanxi Province(No．2015KTZDGY03-03) （No．2015KTZDGY03-03）
